Docker My Note

In this tutorial, I have written Docker my note. Docker the essential for DevOps Roles.

Cannot connect to the Docker daemon. Is the docker daemon running on this host?

Solve the problem: Add this user to the docker group.

Detach and Attach

• Detach : Ctrl-p + Ctrl-q
• Attach: docker attach [container]

Why can not detach?

Solve the problem: docker run with “-i”, “-t” options. http://stackoverflow.com/questions/20145717/how-to-detach-from-a-docker-container

Docker runs without -it, but attach, so can not type CTRL-C

Close your terminal! Anything OK.

To safely detach…

Docker runs without “-i”, “-t” options. But you want to detach, if you hit Ctrl-C then the docker process be killed.
To avoid it, attach with

--sig-proxy=false

You want to log in to a container…

docker exec -it [container-name] /bin/bash

start on os-startup

docker command

 --restart=always

docker-compose add restart: always in docker-compose.yaml file

search a docker image in hub.docker.com

docker search nginx

Download a docker image from hub.docker.com

docker image pull <image_name>:<image_version/tag>

List out docker images from your local system

docker image ls

Expose your application to host server

docker run -d -p <host_port>:<container_port> --name <container_Name> <image_name>:<Image_version/tag>

List out running containers

docker ps

List out all docker containers (running, stpooed, terminated, etc…)

docker ps -a

Stop/Start a container

docker stop <container_id>

docker start <container_id>

Remove a container

docker rm <container_id>

Docker My Note.

I hope will this your helpful. Thank you for reading the DevopsRoles page!